How can cold code save fragile willpower? This article deeply deciphers the psychological trap of trading from the perspective of behavioral finance. Comprehensively dismantle the quagmire of carrying losses and disposal effects caused by human "loss aversion" instincts, analyze the blind high position caused by fear of missing out (FOMO emotion), and reveal the dangers of adrenaline-driven retaliatory trading after continuous losses. Guide investors on how to use scientific position calculators and negative balance protection to reshape self-disciplined risk control lines of defense.